Harry Trumbore Books

The Field Guide To UFOs: A Classification Of Various Unidentified Aerial Phenomena Based On Eyewitness Accounts

By Patrick Huyghe, Dennis W. Stacy, Harry Trumbore

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Sports Tracing Fun Book

By Karen Braun, Joan Berger, Harry Trumbore

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Zen und die Kunst der Vaterschaft.

By Steven Lewis, Harry Trumbore

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The Field Guide to Lake Monsters, Sea Serpents and Other Mystery Denizens of the Deep

By Loren Coleman

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From the serpentine "Champie" of Lake Champlain to the venerable "Nessie" of Loch Ness, extraordinary-and un-explained-creatures of the deep have been reported in sightings throughout the twentieth...

Field Guide to Extraterrestrials

By Patrick Huyghe, Harry Trumbore

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.